import { test, expect } from "bun:test"
import { Permission } from "../../src/permission"

// toConfig tests (inverse of fromConfig)

test("toConfig - single wildcard rule uses object format", () => {
  const result = Permission.toConfig([{ permission: "read", pattern: "*", action: "allow" }])
  expect(result).toEqual({ read: { "*": "allow" } })
})

test("toConfig - single non-wildcard rule uses object format", () => {
  const result = Permission.toConfig([{ permission: "bash", pattern: "npm *", action: "allow" }])
  expect(result).toEqual({ bash: { "npm *": "allow" } })
})

test("toConfig - multiple rules for same permission use object format", () => {
  const result = Permission.toConfig([
    { permission: "bash", pattern: "*", action: "ask" },
    { permission: "bash", pattern: "npm *", action: "allow" },
  ])
  expect(result).toEqual({ bash: { "*": "ask", "npm *": "allow" } })
})

test("toConfig - mixed permissions", () => {
  const result = Permission.toConfig([
    { permission: "read", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "npm *", action: "allow" },
    { permission: "bash", pattern: "git *", action: "allow" },
  ])
  expect(result).toEqual({
    read: { "*": "allow" },
    bash: { "npm *": "allow", "git *": "allow" },
  })
})

test("toConfig - empty rules returns empty object", () => {
  const result = Permission.toConfig([])
  expect(result).toEqual({})
})

test("toConfig - wildcard then specific promotes to object", () => {
  const result = Permission.toConfig([
    { permission: "bash", pattern: "*", action: "ask" },
    { permission: "bash", pattern: "rm *", action: "deny" },
  ])
  expect(result).toEqual({ bash: { "*": "ask", "rm *": "deny" } })
})

test("toConfig - roundtrip with fromConfig (simple) always uses object format", () => {
  const config = { read: "allow" as const, bash: "ask" as const }
  const rules = Permission.fromConfig(config)
  const result = Permission.toConfig(rules)
  // toConfig always uses object format to avoid erasing existing granular rules on merge
  expect(result).toEqual({ read: { "*": "allow" }, bash: { "*": "ask" } })
})

test("toConfig - roundtrip with fromConfig (object)", () => {
  const config = { bash: { "*": "ask" as const, "npm *": "allow" as const, "git *": "allow" as const } }
  const rules = Permission.fromConfig(config)
  const result = Permission.toConfig(rules)
  expect(result).toEqual(config)
})

test("toConfig - scalar-only permission uses scalar format", () => {
  const result = Permission.toConfig([{ permission: "websearch", pattern: "*", action: "allow" }])
  expect(result).toEqual({ websearch: "allow" })
})

test("toConfig - scalar-only permission with non-wildcard pattern is skipped", () => {
  // doom_loop uses always: [toolName], so pattern can be "bash" etc.
  // Non-wildcard patterns for scalar-only permissions can't be represented
  // in the config schema — they only work in-memory (known limitation).
  const result = Permission.toConfig([{ permission: "doom_loop", pattern: "bash", action: "allow" }])
  expect(result).toEqual({})
})

test("toConfig - mixed scalar-only and rule-capable permissions", () => {
  const result = Permission.toConfig([
    { permission: "websearch", pattern: "*", action: "allow" },
    { permission: "todowrite", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "npm *", action: "allow" },
  ])
  expect(result).toEqual({
    websearch: "allow",
    todowrite: "allow",
    bash: { "npm *": "allow" },
  })
})

// Tests for null delete sentinel handling (null = "remove this key from config")

test("fromConfig - null entries in PermissionObject are skipped", () => {
  const config = { bash: { "*": "ask" as const, "npm *": null } }
  const rules = Permission.fromConfig(config)
  // null is a delete sentinel — only the non-null entry should produce a rule
  expect(rules).toEqual([{ permission: "bash", pattern: "*", action: "ask" }])
})

test("fromConfig - null top-level PermissionRule is skipped", () => {
  const config = { bash: null }
  const rules = Permission.fromConfig(config)
  expect(rules).toEqual([])
})

test("toConfig - null existing entry is treated as absent (new rule wins)", () => {
  // If result[permission] is null (shouldn't happen in practice but defensive),
  // the new rule should be written as a fresh object entry.
  const result = Permission.toConfig([{ permission: "bash", pattern: "npm *", action: "allow" }])
  expect(result).toEqual({ bash: { "npm *": "allow" } })
})